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IMR 4198 vs H4198

Discussion in 'Handloading and Reloading' started by Mikee Loxxer, Jun 7, 2006.

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  1. Mikee Loxxer

    Mikee Loxxer Member

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    I am in the process of loading some 7.5 X 54 MAS cartridges. I am pushing a 130 grain jacketed bullet with 30.5 grains of IMR 4198. In reviewing the loading data in the Lee reloading manual I realized the recipe called for H4198 instead of IMR 4198. What is the difference between the two? Should I not use the IMR 4198?
     
  2. Jim Watson

    Jim Watson Member

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    They are different powders of similar burn rate and unfortunately similar designation manufactured half a world apart. IMR comes from Canada, H from Australia.

    Are you at the maximum load? If not, I would not worry about it.

    Bear in mind that the Lee manual just reprints powder company data; Hodgdon in this case.
     
  3. Mikee Loxxer

    Mikee Loxxer Member

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    Staring grains for H4198 with this bullet is 29 and the do not exceed is 33. I am using 30.5 grains of IMR 4198. Do you think that is close enough to be safe?
     
  4. Jim Watson

    Jim Watson Member

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    Cross-checking some different manuals I see that is in the load range for .30-40 Krag and .300 Savage and I would consider that acceptable for a 7.5 froggie.

    But it is best to read the data closely enough to use the right powder.
     
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